Key bolt



G A. H. WESTON AND J. ZILLIOX.

KEY son. I APPLICATION HLED NOV.9, I920- 1320005, 'Pjatented June20,1922"- mvaprroaa.

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NETE TTIES ALONZO H. WESTON, OF BUFFALO, AND JOHN. ZILLIOX, 0F ORCHARDPARK, NEW YORK, ASSIGNORS, BY MESNE ASSIGNMENTS, TO THE DIAIPHONE'SIGNALCOM- PANY, LIMITED, OF 'IORONTQ, ONTARIO, CANADA. i 7

KEY BOLT.

Specification of Letters Patent.

Patented June 20,1922.

Application filed November 9, 1920. Serial No. 422,906.

To all whom it may concern:

Be it known that we, ALoNzo H. Wns'roN, of the city of Buffalo, and JOHNZrLLIoX, of Orchard Park, both in the county of Erie, State of New York,United States of America, have invented certain new and usefulImprovements in Key Bolts, of which the following is a specification.

This invention relates to slotted bolts of the type shown and describedin United States Letters Patent No. 1266334 dated May 14th, 1918, inwhich a slot for a wedge key is formed in the bolt by bending on itselfa blank of half round section in which the center has been deformed,without removing material, to offset the flat face a distancesubstantially equal to half the width of the slot to be formed. Thisdeformation of the blank results in a slight increase in the crosssectional dimensions of the blank particularly across the sides of theslot. This slight increase of diameter is not material in a railwaybolt, but is objectionable in a bolt for use in drawing up shi plates toposition. The object of my invention therefore is to devise means forproducing a slotted bolt of the same diameter at substantially all partsof its stem by a process involving such displacement of the metal of theblank and without requiring any filling, grinding or machining of theblank or finished bolt.

We attain our object by forming a blank substantially as hereinafterdescribed and illustrated in the accompanying drawings in which Fig. 1is a plan view of the blank from which the improved bolt is formed;

Fig. 2 a side elevation of the same;

Fig. 3 a plan view of the finished bolt;

Fig. 4 a similar view at right angles to Fig. 3; and

Fig.5 a cross section through the slotted parts of the bolt;

Fig. 6 a cross section on the line a-a in Fig. 2; and

Fig. 7 a cross section illustrating the formation of the slot in thebolt by suitable dies.

In the drawings like numerals of reference indicate corresponding partsin the different figures.

The bolt is formed from the blank shown in Figs, 1 and 2. This blank isformed of a half round bar somewhat more than twice the length of thefinished bolt. The middle of the blank for a distance equal to twice thedesired length of the slot to be formed in the bolt is reduced in widthas indicated at 1, preferably symmetrically as shown, the amount ofmetal removed being approximately equal to the cubical contents of theslot to be formed. This metal may be removed either before orsimultaneously with the offsetting of the fiat faces of the middleportions of the blank to form the slot. When such a blank is bent uponitself to form a bolt and the metal displaced to form a slot, thedisplacing of the metal does not increase the cross sectional dimensionsof the slotted portion of the bolt, the forming dies being such as tocause the metal to flow parallel to the fiat faces .of the blank intothe space provided by the reduction of width hereinbefore'referred to.

As there is no actual lateral displacement of metal at the middle partof the blank which forms the end of the bolt, the full width of theblank may be maintained at this point as indicated at 2 in the drawings.The head 3 of the bolt is formed in any suitable manner.

What we claim as our invention is 1. A process of forming a slotted keybolt which consists in forming a half round bar of reduced width at itsmiddle for a distance equal to twice the desired length of the slot,bending said bar on itself at the middle and displacing the metaltooffset the fllat faces of the middle portion to form the s 0t.

2. A process of forming a slotted key bolt which consists in forming ahalf round bar of reduced width at its middle for a distance equal totwice the desired length of the slot but leaving a small portion just atthe middle point of the original width, bending said bar on itself atthe middle and displacing the metal to offset the fiat faces of themiddle portion to form the slot.

3. A blank for a slotted key bolt comprising a half round bar adapted tobe bent on itself at the middle, said bar being of the same thicknessfrom end to end and having parts thereof at each side of the middle ofsubstantially equal length reduced in width, the parts adjacent the endsbeing of substantially full. half round section.

4. A blank for a Slotted key bolt comprisdle being of substantially fullhalf round ing a half round bar adapted to be bent on section. itself atthe middle, said bar being of the Signed at Buffalo, N. Y., this firstday of 10 same thickness from end to end and having November, 1920.parts thereof at each side of the middle of substantially equal lengthreduced in width, ALONZQ H. WESTON. the parts adjacent the ends andatthe fil'ld- JOHN ZILLIO'X.

